128724264 has 24 divisors (see below), whose sum is σ = 348628410. Its totient is φ = 42908064.

The previous prime is 128724251. The next prime is 128724311. The reversal of 128724264 is 462427821.

It can be written as a sum of positive squares in only one way, i.e., 73102500 + 55621764 = 8550^2 + 7458^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×128724264² = 33139872284683392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 893847 + ... + 893990.

Almost surely, 2^128724264 is an apocalyptic number.

It is an amenable number.

128724264 is an abundant number, since it is smaller than the sum of its proper divisors (219904146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128724264 is a wasteful number, since it uses less digits than its factorization.

128724264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787849 (or 1787842 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 128724264 is about 11345.6715975741. The cubic root of 128724264 is about 504.9171696976.

The spelling of 128724264 in words is "one hundred twenty-eight million, seven hundred twenty-four thousand, two hundred sixty-four".